Armchair Traveller :(
Mostly I shall have pool which finishes quickly. Moreover it will be timed.Not sure if pool/snooker charged by game or by time taken ,pool and snooker can take lot of time to finish (till the last black ball is gone)amongst average skilled and one group can hog the table for a long time turning off potential customers.
I have setup a gaming room at my place and researched games that can be put up in limited space and I skipped out on pool table,foosball tables are smaller so it max use of space.Foosball finishes quickly. Airhockey is good too.Check out table shuffleboard...its a quick fun game
Throw in some tvs with sports and some karaoke machines(Your place can be a hub during sports(IPL))
Needless to say you need to plan for rains.
That for suggestion of shuffleboard. Yup it looks like good fun. Any more such games in mind. Probably there is no presence of Shuffleboard games in India and it will be a novelty.
Gaming area as well as 60% of lounge area will be covered. Open area too will have unbrellas or similar setup to make sure the space doesn't go unused during monsoon.